Analytic properties of the Landau gauge gluon and quark propagators

Details Analytic properties of the Landau gauge gluon and quark propagators Analytic properties of the Landau gauge gluon and quark propagators

2003-09-08

arxiv.org/abs/hep-ph/0309077v2

Phys.Rev.D70:014014,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

42 pages, 16 figures, revtex; version to be published in Phys Rev D

Scientific paper

10.1103/PhysRevD.70.014014

We explore the analytic structure of the gluon and quark propagators of Landau gauge QCD from numerical solutions of the coupled system of renormalized Dyson--Schwinger equations and from fits to lattice data. We find sizable negative norm contributions in the transverse gluon propagator indicating the absence of the transverse gluon from the physical spectrum. A simple analytic structure for the gluon propagator is proposed. For the quark propagator we find evidence for a mass-like singularity on the real timelike momentum axis, with a mass of 350 to 500 MeV. Within the employed Green's functions approach we identify a crucial term in the quark-gluon vertex that leads to a positive definite Schwinger function for the quark propagator.

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